解方程 60x=90(x-15)
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解方程60x=90(x-15)解方程60x=90(x-15)解方程60x=90(x-15)60x=90(x-15)60x=90x-90*1590x-60x=90*1530x=90*15x=4560x=
解方程 60x=90(x-15)
解方程 60x=90(x-15)
解方程 60x=90(x-15)
60x=90(x-15)
60x=90x-90*15
90x-60x=90*15
30x=90*15
x=45
60x=90(x-15)
60x=90x-1350
30x=1350
x=45
90x-60x=90*15
30x=1350
x=45
60x=90(x-15)
60x=90x-1350
30x=1350
x=45
45
45
60x=90(x-15)
6x=9x-135
3x=135
x=45
60x=90x-1350
1350=30x
x=45
60x=90x-15x90
60x=90x-1350
60x-90x=-1350
30x=1350
x=45